Stephen Cobeldick

5,802 total contributions since 2014

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Answered
How to Scale Array Indices to larger array indices?
Here is one simple approach based on diff and find. Because a scaling factor of 68608 is rather inconvenient I used a scaling f...

2 hours ago | 0

Answered
str2num strange behaviour
"str2num strange behaviour" It is not strange behavior at all: str2num (unfortunately) relies on eval, as the str2num help clea...

2 hours ago | 1

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How to extract data from a multi layered structure
"How can i calculate the minimum of a given field (min_temp for example) ?" You do not define what "the minimum" means for mul...

9 hours ago | 0

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Shift data in row when NaNs occurs
>> M = [0.30,NaN,0.24,0.26,0.67,0.37;0.49,0.35,0.55,NaN,0.43,0.54] M = 0.30000 NaN 0.24000 0.26000 0.67000 0....

1 day ago | 0

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Answered
Reading Data from txt file with a unique FormatSpec
Method one: fileread and regexp and str2double: >> S = fileread('Test.txt'); >> M = reshape(str2double(regexp(S,'[+-]?\d*\.?\d...

1 day ago | 0

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Directory Issue - not finding subfolder
"Any advice on how to approach this issue is appreciated." Do not use cd. Do not add data folders to the Search Path. Use abs...

1 day ago | 1

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filter string in the string
>> str = 'this matlab is a good software, it is a version 9.4 which is equal to 2018a'; >> out = regexp(str,'\d+\.\d+','match'...

2 days ago | 0

Answered
Store results of for loop in matrix
Use a cell array: N = numel(ab); out = cell(1,N); % preallocate cell array. for k = 1:N ... your code out{k} = Ncel...

3 days ago | 0

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Answered
How to pass Options as an argument in quadprog
x = quadprog(H,f,[],[],[],[],[],[],[],options)

3 days ago | 0

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Answered
convert string of numbers to double
More efficient than converting to symbolic and probably also str2num: >> S = '676, 933, 1645, 2069:.025:2069.5, 2327:.025:2327....

3 days ago | 0

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How to create new file in another folder?
" But I have create the new file in another folder . How can I do this?" All MATLAB functions that read/write to data files acc...

3 days ago | 1

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Answered
how to load a variable in a loop
D = dir('CC*/Rest/ROI_epi.mat'); for k = 1:numel(D) F = fullfile(D(k).folder,D(k).name); S = load(F); ROI = S.RO...

3 days ago | 0

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Why use x=load('myFile.mat')?
From the discussion following this answer: "why should people never ever load mat files into the workspace?" Because load-ing ...

3 days ago | 1

Answered
Increasing number of points in a plot without ruining the shape
Try using method spline or pchip and see if they do what you want: interp1(...,'pchip') https://www.mathworks.com/help/matlab/...

3 days ago | 0

Answered
Testing if an input is numeric or character
if isnan(Sbase_gerador) ... end

4 days ago | 0

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Answered
how to call different functions of a matlab file to another matlab file
Local functions are only visible to other functions within the same M-file: https://www.mathworks.com/help/matlab/matlab_prog/l...

5 days ago | 0

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saving for loop results not working
"Can anyone please explain to me what im doing wrong and how to fix it." Your first code does not store/allocate/sum the output...

5 days ago | 0

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lsqcurvefit Error using /
Replacing both of the mrdivide operators with rdivide operators gets rid of the error: >> fun = @(x,xd) (x(1)*(1+(sqrt(1+xd./x(...

5 days ago | 0

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Answered
Find mean of rows containing decimal numbers in between integers in a column
>> Y = [1,0.098,0.00076,0.01,2,0.099,0.007,2,0.003,0.04,0.1,4]; >> X = cumsum([1;diff(~mod(Y(:),1))]~=0); >> Z = accumarray(X(...

5 days ago | 4

Answered
How to set constraints of griddata results are all non-negative?
"Is there any way to control the range of interpolation results?" You could simply adjust the output data yourself: A = max(0,...

5 days ago | 0

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Answered
fopen does not work when put text code
You are adding extra single quotes, here: lgttext = (".lgt'"); % ^ superfluous Roriginaltitle = insertBefore(sp...

6 days ago | 3

Answered
How do I change a function name within a loop using variables?
You can store function handles in a cell array and use indexing: >> C = {@(x)2*x+3,@(x)sqrt(x)+1}; % {1st fun,2nd fun} >> C{1}...

6 days ago | 2

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Answered
How to split an array by same length and make a matrix?
>> a = 1:72; >> b = reshape(a,24,[]).' b = 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 ...

6 days ago | 1

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Answered
Having trouble changing mouse cursor to "watch" to indicate that function is busy.
This worked for me: set(gcf, 'Pointer','watch') drawnow() % <- you need this ... set(gcf, 'pointer','arrow') Note that the ...

7 days ago | 0

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Answered
Interpolating linearly between many values in a vector
>> t_old = 1:10; % times 1:N >> rate = 1000; % 1 kHz >> t_new = linspace(t_old(1),t_old(end),(numel(t_old)-1)*rate+1);

7 days ago | 0

Answered
How to check if one of output variables is not called
You can use nargout to detect how many output arguments are requested: if nargout>0 varargout{1} = x+y; end if nargout>1...

7 days ago | 0

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Answered
I have multiple equations that depend on a specific value and would like matlab to ask the user which equation to use and what the specific value is and then print that value but it's giving me trouble.
Your code is mixed up with the (meta-)data (i.e. the variable names named as material types), which is a very bad practice and s...

7 days ago | 0

Answered
cprintf not work in linux command window
"open a command window in Linux system" cprintf works in the MATLAB Command Window: https://www.mathworks.com/help/matlab/ref/...

7 days ago | 0

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Answered
Interrupting a Callback with a Push Button
" Is there another trick you recommend for this issue" The simplest solution is to use nested functions: simply define a logica...

7 days ago | 0

Answered
Conversion to cell from double is not possible
A = cell2mat(dataC(:,1)); B = A * pi * 2; dataC(:,3) = num2cell(B); % <- you need NUM2CELL!

7 days ago | 1

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